Island



A. H. TINGLEY.

. Furnae Damper.'A n ,N O.' 99,972. y Patentedfeb. 15,1870.

N.FETERS. PHOTO-LITHOGRAPHEH, WASHINGTON. D C.

waited ,lteren ALBERT H. TINGLEY, OF` PROVIDENCE, RHODE ISLAND.

Latas Patent No. 99,972, ma Fam/'ry 15, 1870.

AUTOMATIC HEAT-REGULATOR'FOR HOT-AIR FURN'ACES' The Schedule referred to in these Letters Patent and making part of the lame To all whom it may concern:

Be it known that I, ALBERT H. TINGLEY, of the city and county of Providence, and State of Rhode Island, have invented a certain new and useful Improvement in Automatic Heat-Regulators for Hot-Air I'Furnaces, Suc.; and I do hereby declare that the followlng specilication, taken in connection with the drawings making a part of the same, is a full, clear, and ex-A act description thereof.

Figure 1 is a view, in perspective, ofthe apparatus applied to a hot-air furnace.

Figures 2, 3, 4, 5, and 6 are views of detailed partsv upon a larger scale than in fig. 1.

Figure 7 is a modification of the mechanical devices shown at figs. 3 and 4.

The present invention relates to certain improvements in the apparatus for regulating hot-air furnaces, Ste., for which Letters Patent of'the United States were granted to me October 30, 1866.

The essential features of such apparatus, so-far as is necessary to be stated for understanding the hereinafter-described improvements, are the employment of two vessels filled with air, or other elastic iinid, connected by a pipe, a, in combination, the one with the hot-air chamber of a heating apparatus, and the other with the cold-air supply; the contents of which vessels, whether air or other like fluid, are increased or diminished in volume by ,fluctuations in the temperature of the surrounding air in the places wherein they are respectively situated, and such change in volume, being accompanied by movement causing pressure upon the one side or the other of a sensitive diaphragm, induces changes in the position of the valve which governs the admission of draft-air to the fire-box of the furnace.

I employ the same principle in the present case, my improvement being limited, first, to the devices for operating the draft-valve through the pressure upon the diaphragm, and adjusting the degree of force which shall be required to pwduce a movement of the valve;`

and, second, to the peculiar construction ofthe draftpipe at the point where the damper is combined there-y with.

A, lig. 1, represents the air-chamber of a furnace; B the vessel located within the same; C a similar vessel located in the cold-air supply; a the pipe connecting the two vessels; D the enlargement of a branch from the pipe a, containing the diaphragm; and v E the draft-pipe, within which is the valve which regulates the supply of draft-air to the fire-box.

The diaphragm, which is made of vulcanized rubber pir other suitable material, is shown in section at F,

g. 4. A rod, b, connects the central point of the diaphragm with the vibrating lever G.

. Understanding that tig. 4 is a view of the back side of lig. 2, it will be seen that the lever G is suspended from a pivot, e, projecting from the rear side of the dial-plate H.

The lower extremity of the lever G is forked,`and engages with ythe wrist pin g-of a crank attached to vthe shaft of the damper valve I, froml which arrangement it is evident that the distention of the diaphragm either way will operate the damper.

It is necessary, however, for the practical working of the apparatus that a means should exist for adjusting the degree of resistance which, according tothe circumstances of the case, the force vdeveloped by thel variation of the volume of air or fluid in the vessels B and O must overcome 'to change the damper in the draft-pipe E. Accordingly, two coiled springs, J J', are arranged, one upon each side of the lever G.

These are secured at their lower ends to suitable eyes, h, attached to the .lever Gr, and are united at their upper ends by a chain, or other flexible connection, K.

The chain K passes over a drum, L, and is fastened thereto by a pin, t'. This, drum has its shaft mounted in the dial-plate H, and upon the face side is a pointer, P. rIhe friction between the drum and the face-plate should be greater than the power of either one of thesprings.

can overcome,- so that when the pointer `is moved to the, right or to the left of the zero point of the scale on the dial-plate, the drum being partially rotated therev by, and straining one of thes prings proportionately to such extent of movement, will remain at the point whe-re it is set. In case the friction of the part-s is insullicient, various devices, as, for instance, a clampscrew or a stop-pin, may be used to keep the pointer to the required number ou the scale, and which may, if so constructed, indicate the pressure iu pounds necessary to be overcome to move the lever G against the resistance of the spring.

'From the foregoing it will be understood that when the pointer has been set toward warmer, the spring J will be extended to a degree which will canse it to hold the, damper in the draft-pipe open with a power due to the tension of the spring at that strain. Sp

soon as the air-chamber of the furnace has become so f much heated that the air in the vessels B and C presses with a superior force upon the diaphragm, the damper 4 will close. Upon the other hand, when the pointer isset toward colder,7 the damper will be held shut with a force due to the tension ofthe spring J at that strain, which will be overcome and the' damper opened when the pressure of the air in the vessels B and C, from contraction, falls so far below the atmospheric pressure v of the air in the furnace cellar that the pressure uponl the diaphragm .from the outside is in excess of the power of the spring.

In place of the force of springs to hold the damper open or shut, as above explained, the gravity of weight may be used. An arrangement for this purpose is clearly shown at fig. 7, and which is simpler in coustruction than the one above described.

A further improvement consists in the peculiar construction of the draft-pipe at the point where the damper is combined therewith, whereby nearly regular progressive increase of area of opening, or cica versa, is obtained by the movement of the damper.

The valve I, figs. 5 and 6, is circular in form, and is fitted like au ordinary pipe-damper to the draft-pipe E.

N N are respectively' segments of that which, if complete, would be a hollow prolate spheroid, and are placed opposite to each other in contraction of the pipe E, the one above and the other below the axis of the damper, as seen at fig. 6. If the spheroidal lips N N were segments of a true sphere of the same diameter as the circular valve I, it would be apparent that the draft-pipe would be closed during all the time that the damper was moving from a: to y, tig. 6; but inasmuch as the figure of the spheroid is as shown in section, it is evident that a gradually-increasing area of opening, or lvice versa, will attend the movement of the damper so long as it is moving within the limits of the segments ofthe spheroid; and in practical op eration, while regulating the draft of the furnace, the

damper oscillates between the points x and y.

For convenience in closing entirely the draft during the night time, a stop or detent, M, iig. 2, is so aI'-, ranged as to be made to engage, at pleasure, with a pin set in the face ofthe lever G, and hold the damper-valve shut.

What I claim as my invention, and desire to secure by Letters Patent, isf 1. The combination ofthe diaphragm F, or its equivalent device, sensitive to changes in temperature, in a heat-regulator, with the damper for checking the firedraft by meansof the vibrating lever G, provided with adjustable resisting springs J J or equivalent Weights,` substantially as described.

2. The combinationof the damper I, the segment of a hollow prolate spheroid, N N', and the draft-pipe l E, substantially as described, for the purposes speci fied.

ALBERT H. TINGLEY. Witnesses:

EDWARD G. AMES, PETER F. HUGHES. 

